Andrea, This chip does what you want: http://leapsecond.com/pic/picpet.htm Input frequency is 0.01 Hz to 100 Hz. Output is microsecond time-stamp and event-count over RS232. You use a PC to log and process the data (into frequency, period, counts, etc.). I use it for all sorts of low frequency work.
But you'd have to add the 5V power supply and binding post to meet your "laboratory instrument" requirement. /tvb ----- Original Message ----- From: "Andrea Baldoni" <[email protected]> To: <[email protected]> Sent: Friday, April 18, 2014 10:17 AM Subject: [time-nuts] Very slow freq. counter / event counter > Hello. > > In the lab, I would like to have an event counter that can double as > frequency/period counter, with maximum clock rate in the order of the tens > of Hz or so, better with TIC function (aka "chronometer"). Resolution need > not be better than 1/100s, counts to 9999, but the input should be simple and > permissive, something like 0-5V or 0-12V, or short-to-activate. > > I own a Racal-Dana 1995 than can count periods to 1700s, but can't be used > as event counter and the inputs are delicate, needing care and attenuators. > > I also have an Agilent 34401 that can count frequency; the input is very > versatile but, for whatever reason they limited the lower frequency to 3Hz > so it can't measure slow signals. It also can't be used as event counter > or as TIC. > > I know there are some industrial timer/counters (for example the chinese Sommy > /Autonics CT series) but I would like more to have a laboratory instrument, > with binding post in the front, mains power, etc... > A vintage would be good also, just maybe not so vintage to use dekatron tubes > :) > (nixie are ok, but it should not weight a ton or shipping to Italy would be > prohibitive) > > Someone has a suggestion? > > Best regards, > Andrea Baldoni _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
